Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 325mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke325 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100S
The AirTAC SAIJ40X325-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 225-325 mm usable travel window by allowing you to trim up to 100 mm from the 325 mm nominal stroke. Delivering 628 N of push force at 0.5 MPa, it handles mid-range actuation while enabling precise end-position tuning during commissioning without external stops.
This variant features a SUS304 stainless steel rod for corrosion resistance and includes a magnet for CMSE and DMSE sensors. Because the 325 mm stroke is relatively long, the M12x1.25 rod thread and 16 mm diameter should be paired with an external guide to manage side loads. The rear adjuster acts solely as a travel stop, so live air is required to maintain position.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 325 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×325 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100S Is Used
Product Changeover
Dial in the exact end-stop for different package lengths on a packaging line without swapping cylinders or adding physical shims.
Machine Setup
Fine-tune the 225-325 mm travel window during commissioning to perfect the seating force of a pressing operation.
Variable Diverting
Adjust the retract position on the fly to handle varying product sizes on a conveyor system without reprogramming the motion controller.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100S the Right Cylinder?
Choose this adjustable-stroke model when a machine setup requires variable end-stops or frequent product changeovers, avoiding the need to physically swap out a fixed-stroke SAI cylinder. If your application needs less push force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa; stepping up to a 50 mm bore provides 982 N. To match this ISO 15552 footprint exactly, specify a 40 mm bore, 325 mm stroke, 100 mm adjustment, PT tapered ports, SUS304 rod, and the -S magnet.
For strokes of 325 mm or more, always support the load with an external guide to prevent excessive side-loading on the rod. Remember that neither the rear adjuster nor the variable air cushions will hold a load without continuous air pressure. If your machine requires true fail-safe load holding, use an external rod lock or pilot-operated check valve, or select the SAIL or BSAI series.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-100S FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. At the maximum pressure of 1.0 MPa, it delivers up to 128 kgf.
The rear adjuster screw lets you shorten the effective travel from the 325 mm nominal stroke by up to 100 mm, creating a 225-325 mm usable window. It functions as a mechanical stop to set the retract position and does not lock the load without live air pressure.
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